ABAP Select data from SAP table BAPIRELHHEADINFO into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BAPIRELHHEADINFO table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to BAPIRELHHEADINFO. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the BAPIRELHHEADINFO table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_BAPIRELHHEADINFO TYPE STANDARD TABLE OF BAPIRELHHEADINFO,
      WA_BAPIRELHHEADINFO TYPE BAPIRELHHEADINFO,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <BAPIRELHHEADINFO> TYPE BAPIRELHHEADINFO.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BAPIRELHHEADINFO.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BAPIRELHHEADINFO
  INTO TABLE IT_BAPIRELHHEADINFO.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BAPIRELHHEADINFO
*  INTO TABLE @DATA(IT_BAPIRELHHEADINFO2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_BAPIRELHHEADINFO INDEX 1 INTO DATA(WA_BAPIRELHHEADINFO2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BAPIRELHHEADINFO ASSIGNING <BAPIRELHHEADINFO>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BAPIRELHHEADINFO>-RELID = 1.
<BAPIRELHHEADINFO>-LANGU = 1.
<BAPIRELHHEADINFO>-RELSDIR = 1.
<BAPIRELHHEADINFO>-MANDT = 1.
<BAPIRELHHEADINFO>-RELSTRID = 1.

ENDLOOP.

LOOP AT IT_BAPIRELHHEADINFO INTO WA_BAPIRELHHEADINFO.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BAPIRELHHEADINFO-RELSNAME, sy-vline,
  WA_BAPIRELHHEADINFO-RELNODETYPE, sy-vline,
  WA_BAPIRELHHEADINFO-RELTYPE, sy-vline,
  WA_BAPIRELHHEADINFO-RELLINKTABLE, sy-vline,
  WA_BAPIRELHHEADINFO-RELTCODE, sy-vline,
  WA_BAPIRELHHEADINFO-NO_LEVEL_RESTR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BAPIRELHHEADINFO you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_BAPIRELHHEADINFO TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_BAPIRELHHEADINFO INTO WA_BAPIRELHHEADINFO.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_BAPIRELHHEADINFO-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPIRELHHEADINFO-LANGU.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_BAPIRELHHEADINFO_STR, 
RELID TYPE STRING,
LANGU TYPE STRING,
RELSDIR TYPE STRING,
MANDT TYPE STRING,
RELSTRID TYPE STRING,
RELSNAME TYPE STRING,
RELNODETYPE TYPE STRING,
RELTYPE TYPE STRING,
RELLINKTABLE TYPE STRING,
RELTCODE TYPE STRING,
NO_LEVEL_RESTR TYPE STRING,
RELNAME TYPE STRING,
RELT TYPE STRING,
RELSNAME TYPE STRING,
RELSTRT TYPE STRING,
RELSTRID TYPE STRING,
RELSNOD TYPE STRING,
RELNODETYPE TYPE STRING,
RELNODETABLE TYPE STRING,
RELNODEFIELD TYPE STRING,
RELDSTR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BAPIRELHHEADINFO_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_BAPIRELHHEADINFO_STR-RELID sy-vline 
WA_BAPIRELHHEADINFO_STR-LANGU sy-vline 
WA_BAPIRELHHEADINFO_STR-RELSDIR sy-vline 
WA_BAPIRELHHEADINFO_STR-MANDT sy-vline 
WA_BAPIRELHHEADINFO_STR-RELSTRID sy-vline 
WA_BAPIRELHHEADINFO_STR-RELSNAME sy-vline 
WA_BAPIRELHHEADINFO_STR-RELNODETYPE sy-vline 
WA_BAPIRELHHEADINFO_STR-RELTYPE sy-vline 
WA_BAPIRELHHEADINFO_STR-RELLINKTABLE sy-vline 
WA_BAPIRELHHEADINFO_STR-RELTCODE sy-vline 
WA_BAPIRELHHEADINFO_STR-NO_LEVEL_RESTR sy-vline 
WA_BAPIRELHHEADINFO_STR-RELNAME sy-vline 
WA_BAPIRELHHEADINFO_STR-RELT sy-vline 
WA_BAPIRELHHEADINFO_STR-RELSNAME sy-vline 
WA_BAPIRELHHEADINFO_STR-RELSTRT sy-vline 
WA_BAPIRELHHEADINFO_STR-RELSTRID sy-vline 
WA_BAPIRELHHEADINFO_STR-RELSNOD sy-vline 
WA_BAPIRELHHEADINFO_STR-RELNODETYPE sy-vline 
WA_BAPIRELHHEADINFO_STR-RELNODETABLE sy-vline 
WA_BAPIRELHHEADINFO_STR-RELNODEFIELD sy-vline 
WA_BAPIRELHHEADINFO_STR-RELDSTR sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.